A multi-piece composite girder bridge upper and lower integral structure and its construction method

Abstract

The invention discloses an upper and lower integral structure of a multi-piece type combined beam bridge and a construction method thereof. The upper and lower integral structure mainly comprises a beam, a span main beam and a connection structure which is arranged between the beam and the span main beam. The upper and lower integral structure is characterized in that the span main beam is a multi-piece type steel and concrete combined steel plate beam or a multi-piece type steel and concrete combined steel box beam; the beam is formed by concrete materials; the steel structure portion of the span main beam is connected with the beam through the connection structure; the concrete portion of the span main beam and the beam are directly connected together. According to the upper and lower integral structure of the multi-piece type combined beam bridge and the construction method thereof, the beam is changed into the concrete beam from the conventional steel structure beam and accordingly the cost is reduced; the site welding work is reduced, the construction method is conventional, simple and convenient, the construction difficulty is reduced, and the construction quality is easy to control; the beam and the span main beam are located in the same elevation plane to form the integral structure and accordingly the occupied clearance under the bridge is not too much, the structural height is small, and the bridge landscape is good; the maintenance work in the later period is reduced.

Description

technical field [0001] The invention relates to the technical field of bridge civil construction, in particular to a multi-piece composite girder bridge upper and lower integral structure and a construction method thereof. Background technique [0002] Beam bridges account for the vast majority of conventional bridges, and beam bridges are classified according to structural systems, generally including simply supported systems and continuous (rigid frame) systems. According to the classification of building materials, there are generally concrete girder bridges, steel structure girder bridges, and steel-concrete composite structure girder bridges. Steel-concrete composite structures are divided into composite steel plate girders, composite steel box girders, and corrugated web steel-concrete composite beams according to different sections. In order to adapt to the situation of large bridge width, multi-piece steel-concrete composite steel plate continuous girder and multi-p...

AI Technical Summary

Problems solved by technology

The advantage of this scheme is that it does not occupy too much clearance under the bridge, the structure height is small, and the corresponding bridge landscape is better, but the amount of steel is more, the cost is higher, and the welding seams are dense near the fulcrum, the welding residual stress is large, and there are a lot of construction site welding. The welding conditions are poor, and the quality of the welds is difficult to guarantee. In addition, the coating and maintenance of the steel structure beams increase the later cost and workload

[0004] When concrete cap beams are used, such as figure 2 As shown, although the construction is relatively conventional and simple, and there is less post-maintenance work, since the upper structure 13 is supported on the cover beam 14 of the lower structure, the structural height of the fulcrum position is the height of the upper structural beam plus the height of the lower structural cover beam, and the structural height is relatively high. If the bridge is too high, the view of the bridge will deteriorate accordingly. To ensure the clearance under the bridge, it is necessary to raise the elevation of the bridge deck, thereby increasing the length of the bridge and increasing the construction cost.

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